Explain how uncontrolled cell division can result in the formation of a tumour
Explain how uncontrolled cell division can result in the formation of a tumour
1 Answer
Questions and Answers
Outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication
Outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication
1 Answer
Explain the importance of mitosis in the production of genetically identical daughter cells during: growth of multicellular organisms replacement of damaged or dead cells, repair of tissues by cell replacement, asexual reproduction
Explain the importance of mitosis in the production of genetically identical daughter cells during: growth of multicellular organisms replacement of damaged or dead cells, repair of tissues by cell replacement, asexual reproduction
1 Answer
Explain the movement of water between cells and solutions in terms of water potential and explain the different effects of the movement of water on plant cells and animal cells (knowledge of solute potential and pressure potential is not expected)
Explain the movement of water between cells and solutions in terms of water potential and explain the different effects of the movement of water on plant cells and animal cells (knowledge of solute potential and pressure potential is not expected)
1 Answer
Investigate the effects of immersing plant tissues in solutions of different water potentials, using the results to estimate the water potential of the tissues
Investigate the effects of immersing plant tissues in solutions of different water potentials, using the results to estimate the water potential of the tissues
1 Answer
Investigate the effect of changing surface area to volume ratio on diffusion using agar blocks of different sizes
Investigate the effect of changing surface area to volume ratio on diffusion using agar blocks of different sizes
1 Answer
Illustrate the principle that surface area to volume ratios decrease with increasing size by calculating surface areas and volumes of simple 3-D shapes (as shown in the Mathematical requirements)
Illustrate the principle that surface area to volume ratios decrease with increasing size by calculating surface areas and volumes of simple 3-D shapes (as shown in the Mathematical requirements)
1 Answer
Investigate simple diffusion and osmosis using plant tissue and non-living materials, including dialysis (Visking) tubing and agar
Investigate simple diffusion and osmosis using plant tissue and non-living materials, including dialysis (Visking) tubing and agar
1 Answer
Describe the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins in cell surface membranes, with reference to stability, fluidity, permeability, transport (carrier proteins and channel proteins), cell signalling (cell surface receptors) and cell recognition (cell surface antigens)
Describe the roles of phospholipids, cholesterol, glycolipids, proteins and glycoproteins in cell surface membranes, with reference to stability, fluidity, permeability, transport (carrier proteins and channel proteins), cell signalling (cell surface receptors) and cell recognition (cell surface antigens)
1 Answer
Investigate the progress of enzyme-catalysed reactions by measuring rates of formation of products using catalase and rates of disappearance of substrate using amylase
Investigate the progress of enzyme-catalysed reactions by measuring rates of formation of products using catalase and rates of disappearance of substrate using amylase
1 Answer
Quiz Leaderboard
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Sourav
Score: 90%
Questions: 20
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Score: 90%
Questions: 10
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Questions: 20
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Questions: 10
Total Questions 2747
Top Questions
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Discuss the advantages and disadvantages of genetically modifying crops, including soya, maize and rice
Genetically modified (GM) crops, such as soybeans, maize, and rice,
Sourav
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Outline the process of genetic modification using bacterial production of a human protein as an example, limited to: (a) isolation of the DNA making up a human gene using restriction enzymes, forming sticky ends (b) cutting of bacterial plasmid DNA with the same restriction enzymes, forming complementary sticky ends (c) insertion of human DNA into bacterial plasmid DNA using DNA ligase to form a recombinant plasmid (d) insertion of recombinant plasmids into bacteria (specific details are not required) (e) multiplication of bacteria containing recombinant plasmids (f) expression in bacteria of the human gene to make the human protein
<h2 class="mb-2 mt-6 text-lg first:mt-3">Process of Genetic Modification Using Bacterial
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Outline examples of genetic modification: (a) the insertion of human genes into bacteria to produce human proteins (b) the insertion of genes into crop plants to confer resistance to herbicides (c) the insertion of genes into crop plants to confer resistance to insect pests (d) the insertion of genes into crop plants to improve nutritional qualities
<h2 class="mb-2 mt-6 text-lg first:mt-3">Examples of Genetic Modification</h2> Genetic modification involves
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Describe genetic modification as changing the genetic material of an organism by removing, changing or inserting individual genes
Genetic modification (GM) refers to the deliberate alteration of an
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Describe and explain the conditions that need to be controlled in a fermenter, including: temperature, pH, oxygen, nutrient supply and waste products
<h2 class="mb-2 mt-6 text-lg first:mt-3">Conditions to Control in a Fermenter</h2> Fermenters
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Describe how fermenters can be used for the large-scale production of useful products by bacteria and fungi, including insulin, penicillin and mycoprotein
<h2 class="mb-2 mt-6 text-lg first:mt-3">The Use of Fermenters for Large-Scale
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Explain the use of lactase to produce lactosefree milk
<h2 class="mb-2 mt-6 text-lg first:mt-3">The Use of Lactase to Produce
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